Goodwill and Intangibles - Schedule of Acquired Intangibles in Accompanying Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 26, 2025	Sep. 27, 2024	Sep. 29, 2023
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 874,894
Amortization	(155,517)	$ (152,667)	$ (147,230)
Foreign currency translation and other	(1,707)
Ending balance	$ 717,670	874,894
Weighted Average Amortization Period (years)	8 years
Customer Relationships, Contracts and Backlog
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 651,894
Amortization	(128,811)
Foreign currency translation and other	(1,808)
Ending balance	$ 521,275	651,894
Weighted Average Amortization Period (years)	6 years
Developed Technology
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 31,515
Amortization	(11,985)
Foreign currency translation and other	(6)
Ending balance	$ 19,524	31,515
Weighted Average Amortization Period (years)	4 years
Trade Names
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 191,485
Amortization	(14,721)
Foreign currency translation and other	107
Ending balance	$ 176,871	$ 191,485
Weighted Average Amortization Period (years)	15 years